Les gisements d'�meraude de la Cordill�re Orientale de la Colombie: Nouvelles donn�es m�tallog�niques

Giuliani, Gaston; Rodriguez, C.T.; Rueda, F.

doi:10.1007/bf00208852

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…The mineralization is contained within hydrothermal breccias (Giuliani et al 1990), centimetre-wide veins and pockets filled with carbonates (calcite, dolomite) and pyrite. Two unusual rock-types are recognized within the areas mined:…”

Section: Geology Of the Depositsmentioning

confidence: 99%

“…Even though miners from the mines of Chivor, Muzo or Coscuez recognize from experience the signs of mineralization, no comprehensive genetic model able to explain these mineralizations had been elaborated (Sutill 1994). Following our original paper in Mineralium Deposita in 1990(Giuliani et al 1990), Ottaway et al (1994 proposed a model for the formation of the Colombian emeralds, based on the characteristics of the Muzo deposit. This model, rather than elucidating the process of formation of Colombian emeralds, adds some confusion to it.…”

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confidence: 99%

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The genesis of Colombian emeralds: a restatement

Cheilletz

Giuliani

1996

Mineral. Deposita

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A renewal of metallogenetical studies of Colombian emerald deposits produced new geological and geochemical data that favour a hydrothermal-sedimentary genetic model for these deposits. A comprehensive model is presented which integrates both chemical and structural aspects and invalidates some aspects of the model recently presented by Ottaway et al. The deposits result from a two-stage process in which shortening tectonics affect the two borders of the Eastern Cordillera of Colombia and provoke decollement planes, thrusting, and thrust-fault related folds in the Early Cretaceous black shale series. Three major descriptive and interpretative aspects of the deposits are presented: (1) time relationships between the two different sets of barren and mineralized extensional veins; (2) the association of graphite and emerald mineralization, and (3) the thermochemical sulfate reduction reaction acting at the site of the emerald deposits to reduce sulfate of evaporitic origin from the hydrothermal brines into hydrogen sulfide by interaction with organic-rich strata.Emerald is one of the most famous exports from Colombia. Even though miners from the mines of Chivor, Muzo or Coscuez recognize from experience the signs of mineralization, no comprehensive genetic model able to explain these mineralizations had been elaborated (Sutill 1994). Following our original paper in Mineralium Deposita in 1990(Giuliani et al. 1990), Ottaway et al. (1994 proposed a model for the formation of the Colombian emeralds, based on the characteristics of the Muzo deposit. This model, rather than elucidating the process of formation of Colombian emeralds, adds some confusion to it. Based on our field and laboratory practise of Colombian emerald deposits, we develop several arguments here against some major points of Ottaway et al. (1994), and we propose a comprehensive model that integrates both chemical and structural aspects.

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Section: Geology Of the Depositsmentioning

confidence: 99%

mentioning

confidence: 99%

The genesis of Colombian emeralds: a restatement

Cheilletz

Giuliani

1996

Mineral. Deposita

Self Cite

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“…(2000) Campo Formoso: Bica, Bode, Braúlio,Cabra,Formiga,Gavião,Lagarto,Marota,Trecho Novo,Trecho Velho (5); Carnaíba-Socotó: Arrozal, Carnaíba, Catuaba, Mundé, Socotó, Veio do Sebo (5) César-Mendes and Ferreira (1998), Johnson and Koivula (1998d) Colombia Giuliani et al (1990aGiuliani et al ( , 1995Giuliani et al ( , 2000, Bosshart (1991), Schwarz (1991bSchwarz ( , 1992 Ruvuma-Nyamtumbo (42) A. Suleman (pers.…”

Section: North America United Statesmentioning

confidence: 99%